Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . Fig:. 64. Pedicellaria, x 60. Fig. 65. Section of Tooth. rodent; they have the same chisel-shaped form,but they have an addition in the shape of a keelwhich runs along the back. If a longitudinal sec-tion of one of these teeth be examined, it will beseen to bear a striking resemblance in its structureto the teeth of the higher animals. The keel is composed of rods of carbonate oflime, lying obliquely to the axis of the tooth. Thechisel-shaped edge consists firstly of a series oftria
Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . Fig:. 64. Pedicellaria, x 60. Fig. 65. Section of Tooth. rodent; they have the same chisel-shaped form,but they have an addition in the shape of a keelwhich runs along the back. If a longitudinal sec-tion of one of these teeth be examined, it will beseen to bear a striking resemblance in its structureto the teeth of the higher animals. The keel is composed of rods of carbonate oflime, lying obliquely to the axis of the tooth. Thechisel-shaped edge consists firstly of a series oftriangular calcareous plates, called the primaryplates; these constitute a framework with whichthe other parts become connected. To these plates,at some distance from the base, are attached a
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
